According to a study done by the state-run Sri Jayadeva Institute of Cardiovascular Sciences and Research in Karnataka, neutralising antibodies were significantly present in all of the participants who had received the booster dose of the Covishield vaccination.
All 350 healthcare personnel evaluated in the state-run Sri Jayadeva Institute of Cardiovascular Sciences and Research's study to evaluate the immunological status of those who had received the booster dose of Covishield vaccination showed a considerable presence of neutralising antibodies. The investigation came to the conclusion that a fourth dose of the vaccination wasn't necessary.